Lignin contains a variety of interunit linkages, which leads to a range of potential decomposition products that can be used as carbon and energy sources by microbes. B-O-4 linkages are the most common in native lignin and associated catabolic pathways have been well characterized. However, the fate of the mono-aromatic intermediates that result from B-O-4 dimer cleavage has not been fully elucidated. Here, we used experimental evolution to identify mutant strains of Novosphingobium aromaticivorans with improved catabolism of a model aromatic dimer containing a B-O-4 linkage, guaiacylglycerol-b-guaiacyl ether (GGE). We identified several parallel causal mutations, including a single nucleotide polymorphism in the promoter of an uncharacterized gene that roughly doubled the growth yield with GGE. We characterized the associated enzyme and demonstrated that it oxidizes an intermediate in GGE catabolism, B-hydroxypropiovanillone, to vanilloyl acetaldehyde. Identification of this enzyme and its key role in GGE catabolism furthers our understanding of catabolic pathways for lignin-derived aromatic compounds.
[doi:10.25345/C5RN30K52]
[dataset license: CC0 1.0 Universal (CC0 1.0)]
Keywords: Novosphingobium aromaticivorans ; Lignin ; Laboratory evolution
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Principal Investigators: (in alphabetical order) |
Richard J. Giannone, Oak Ridge National Laboratory, USA |
| Submitting User: | dlcarper |
Allemann MN, Kato R, Carper DL, Hochanadel LH, Alexander WG, Giannone RJ, Kamimura N, Masai E, Michener JK.
Laboratory evolution in Novosphingobium aromaticivorans enables rapid catabolism of a model lignin-derived aromatic dimer.
Appl Environ Microbiol. 2025 Feb 19;91(2):e0208124. Epub 2025 Jan 23.
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